Malicious PDF — malware analysis report

Static analysis result for SHA-256 267ad7622b25c8d6…

MALICIOUS

PDF

78.2 KB Created: 2021-03-03 04:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 07c9e522d5a60d5d6207360263c52346 SHA-1: e521f32f4cbae618eb4b8fd23349a5d1fa2a34f5 SHA-256: 267ad7622b25c8d6221682377eb95153caf2acbade821c3055f43a7672966885
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document attempts to trick the user into executing commands, which is a common tactic for malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/123?utm_term=how+to+run+java+web+application+in+visual+studio+code PDF link annotation
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/xitodusogurepu.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/aifMuFN/qatar_2022_world_cup_stadiums_images.pdfIn PDF document text
    • http://mezoterilijixa.22web.org/what_causes_coliform_bacteria_infection.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/1jdrjhW/texibulutigezagixer.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/trane_humidifier_filter_thumd300aba00ba.pdfIn PDF document text
    • https://lepamatizetu.weebly.com/uploads/1/3/0/7/130739269/a3a570c2fa3b.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/20667261082.pdfIn PDF document text
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/6405003.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/5201159.pdfIn PDF document text
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/4041.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/Zjdhjjj/quick_views_free_views_boosters.pdfIn PDF document text
    • https://zidoboxeped.weebly.com/uploads/1/3/5/3/135324118/7957841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxolavomuzo.myartsonline.com/12882642576.pdfIn PDF document text
    • http://jukikusikodopom.epizy.com/rifafovajarunedorep.pdfIn PDF document text
    • http://gagagavukemer.rf.gd/dell_latitude_e6540_i7_4th_generation_drivers.pdfIn PDF document text
    • http://doruxujegajaso.rf.gd/hack_netflix_app_android.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 5396 bytes
SHA-256: fd6a0c9cf7a88424e4484ae9d72c7d155e87f1cf9601b616c2d8168c959c7172
font_01_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 10904 bytes
SHA-256: dd7c35385495f28861d28925c8f975610ae7a8973eba83fd09467c6035e1e361

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